Square Holes | McMaster-Carr

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Shape

Rectangular Tube

Round with Keyways

System of Measurement

Outside Width

Material

Aluminum Bronze

Stainless Steel

Outside Height

Wall Thickness

Length

Inside Width

Inside Height

Outside Corner Shape

Export Control Classification Number (ECCN)

REACH

RoHS

Compliant with Exemptions

DFARS Specialty Metals

Square Drive Size

Inside Corner Shape

Yield Strength

Less than 31,000 psi

31,000 psi to 33,999 psi

34,000 psi to 39,999 psi

40,000 psi to 69,999 psi

70,000 psi or greater

Appearance

Specifications Met

Fabrication

Maximum Temperature

Hardness Rating

Minimum Temperature

Hole Width

Tolerance Rating

Hardness

Rockwell M89 to Rockwell M96

Rockwell R110 to Rockwell R120

How can we improve?

1,201 Products

Building and Machinery Hardware

Crank Handles

The offset handle gives extra leverage to maximize turning force

Ratchet Handles

Ratchet Handles

Quickly adjust machine components and valves in tight spaces

Bolt-Together Framing Rails

Bolt-Together Framing Rails

Fasten through equally spaced holes to build and adjust guards, tables, and racks

Bolt-Together Framing Feet

Bolt-Together Framing Feet

Stabilize bolt-together framing structures against floors, walls, and ceilings

Bolt-Together Framing Caps

Bolt-Together Framing Caps

Cover the rough ends of bolt-together framing rails for a finished look

Press-Fit Framing and Fittings

Press-Fit Framing and Fittings

Set up temporary partitions, guards, and displays using only a hammer

Weld-Together Framing and Fittings

Weld-Together Framing and Fittings

Permanently join rails and fittings to assemble heavy duty racks, shelving, and work tables

Bellows

Prevent dust and debris from damaging moving parts

Raw Materials

Steel

Strong, machinable, and weldable—all with material certificates for traceability

Aluminum

Lightweight, easy to machine, and corrosion resistant—all with material certificates for traceability

Stainless Steel

Stainless Steel

Resists corrosion and chemicals in most environments—all with material certificates for traceability

Plastic

A lightweight alternative to metal and glass

Carbon Fiber

The strongest composite we offer; comparable in strength to 6061 aluminum but lighter in weight

Fiberglass

A lightweight alternative to metal and wood widely used in electrical and structural applications

Brass

More machinable than copper and bronze—all with material certificates for traceability

Garolite

A strong, machinable alternative to metal and plastic widely used in circuit boards and gears

Fluid Handling

Valve Handles and Knobs

Valve Handles and Knobs

Replace the handle on most types of valves

Fabricating and Machining

Hole Punches

Punch holes in metal, plastic, and fabric

File Handles

Push, twist, or clamp onto file tangs to securely grip files

Fastening and Joining

Ratchet Wrenches

Ratchet Wrenches

Adjust fasteners in tight spaces without removing and repositioning the wrench

Socket Drivers

Tighten and loosen sockets from above when there isn't room to swing a standard wrench

Wrench Handles

Generate extra torque to loosen stubborn fasteners; also known as breaker bars

Speeder Handles

Speeder Handles

Crank the handle to fasten nuts and bolts quickly

Containers, Storage, and Furniture

Stacking Caps and Targets

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

Material Handling

Shipping Tubes

Protect rods, rolled-up blueprints, and other long, thin objects during shipping

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)